There is no real substitute (MBP kinda bulky and heavy,MBA low res screen)so people have the right to be disappointed.you can't just say "don't buy it if you don't like it".people were waiting for a true successor to Macbook Air eagerly,an improved model with retina screen,sadly turns out it's just a eye candy toy model that lacks performance and functionality.slower,weaker than MBA with huge compromise.
Sound's like you were hoping for a MBA with a larger retina screen in the same sized package (as were a lot of folks - including me). I expect Apple figured out there was no way to do that currently without making compromises that would hurt sales of current popular products (either in terms of computing power and/or battery life and/or cost).
So they bundled all their learnings and tech into a new product and resurrected the plain Macbook (no Air, no Pro) line. It seems to be a pretty polarizing product with more people loving or hating it and fewer people in the middle. Its not a product for everyone and many will find the rMBP or MBA a better (if not perfect) choice for them. Thats not surprising as the more "extreme" a product is, in any direction, the less mass appeal it has.
While I understand your disappointment and that it does not meet your needs, declaring "it's just a eye candy toy model that lacks performance and functionality.slower,weaker than MBA with huge compromise" seems to fly in the face of demand and the preponderance of positive feedback for this product on this forum.
As someone who makes an excellent living with a rMB as my primary computer, I can assure you that, for some, its not just a toy. And while there is no denying it is less powerful and more limited than a MBA in some respects, in other respects its more powerful and less limited. For some, the tradeoffs make it a better machines and for others a worse machine. Blanket statements in either direction aren't very helpful to others. But everyone always appreciates the details on what made it a good fit or bad fit for a particular person.
Hopefully soon, tech will catch up enough, and Apple will perceive enough demand for what you are looking for.